Hi,i haven't been on this site in like 5 years, that is how old she is now, since yesterday, everytime she gets up or lays down, she just falls and slides all over the place, at first i thought it was just her slipping on our wood floor, (because my other dog used to do that) but i let her out this morning, and her back legs seem unstable, i don't have any money for the vet yet, i get my tax check any day now and i will take her as soon as it gets here, but does anyone have an idea of what it could be?? She is aan otherwise healthy dog, beautiful, sweet, full of energy,. And does anyone know what the vet will do? (xrays) and how much it will cost to find out what is wrong???